Lower Aragon
Lower Aragon (Spanish: Bajo Aragón, Aragonese: Baixo Aragón, Catalan: Baix Aragó), also known as Tierra Baja, is a natural and historical region in Aragon, Spain. The name "Lower Aragon" refers to the areas of the lowest altitude within the Ebro river basin, but the historical region encompasses only the river basins of several right tributaries of the Ebro River, namely the Matarranya, Guadalope, Regallo, Martín and Aguas, located between the Ebro and the Iberian mountain range.